\[9-3\div \frac{1}{3}+1\]
1
Use this rule: a÷bc=a×cba\div \frac{b}{c}=a\times \frac{c}{b}.
9−3×3+19-3\times 3+1

2
Simplify  3×33\times 3  to  99.
9−9+19-9+1

3
Simplify  9−99-9  to  00.
0+10+1

4
Simplify.
11

Done
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